Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving
International audience Summer repeated hydrographic surveys and 4 years of mooring observations are used to characterize for the first time the interannual variability of the bottom water in the Mertz Glacier Polynya (MGP) on the East Antarctic shelf (142 E–146 E). Until 2010, large interannual vari...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2014
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Subjects: | |
Online Access: | https://hal.univ-brest.fr/hal-01111515 https://hal.univ-brest.fr/hal-01111515/document https://hal.univ-brest.fr/hal-01111515/file/jgrclacarra.pdf https://doi.org/10.1002/2013JC009124 |
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ftccsdartic:oai:HAL:hal-01111515v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Lacarra, Maïté Houssais, Marie-Noëlle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience Summer repeated hydrographic surveys and 4 years of mooring observations are used to characterize for the first time the interannual variability of the bottom water in the Mertz Glacier Polynya (MGP) on the East Antarctic shelf (142 E–146 E). Until 2010, large interannual variability was observed in the summer bottom salinity with year-to-year changes reaching 0.12 in Commonwealth Bay, the region with the highest sea ice production. The summer variability was shown to be linked to the efficiency of the convection during the preceding winter. The recent freshening of the bottom waters subsequent to the Mertz Glacier calving was well beyond the range of the precalving interannual variability. Within 2 years after the event, the bottom water of the shelf became too light to possibly contribute to renewal of the Antarctic Bottom Water. Rough estimates of the freshwater budget of the Ad elie Depression indicate that the freshening necessary to compensate for net sea ice production in the MGP did not change drasti-cally after the Mertz calving. The year-to-year salinity changes appeared to respond to the MGP activity. Yet, prior to the calving, the convective system in the polynya was also partly controlled by the late winter bottom salinity through a mechanism leading to a sequence of alternatively fresher and more saline bot-tom waters over the period 2007–2010. Exceptional events like the Mertz calving seem to be able to switch over the system into a less stratified state where convection responds more directly to changes in the surface forcing. |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Variabilité de l'Océan et de la Glace de mer (VOG) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Laboratoire de microbiologie des environnements extrêmophiles (LM2E) Centre National de la Recherche Scientifique (CNRS)-Université de Brest (UBO)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) |
format |
Article in Journal/Newspaper |
author |
Lacarra, Maïté Houssais, Marie-Noëlle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael |
author_facet |
Lacarra, Maïté Houssais, Marie-Noëlle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael |
author_sort |
Lacarra, Maïté |
title |
Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_short |
Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_full |
Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_fullStr |
Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_full_unstemmed |
Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_sort |
dense shelf water production in the adelie depression, east antarctica, 2004-2012: impact of the mertz glacier calving |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.univ-brest.fr/hal-01111515 https://hal.univ-brest.fr/hal-01111515/document https://hal.univ-brest.fr/hal-01111515/file/jgrclacarra.pdf https://doi.org/10.1002/2013JC009124 |
long_lat |
ENVELOPE(146.000,146.000,-67.417,-67.417) ENVELOPE(142.500,142.500,-67.000,-67.000) ENVELOPE(144.500,144.500,-67.667,-67.667) |
geographic |
Adelie Depression Antarctic Commonwealth Bay East Antarctica Mertz Glacier The Antarctic |
geographic_facet |
Adelie Depression Antarctic Commonwealth Bay East Antarctica Mertz Glacier The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.univ-brest.fr/hal-01111515 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2014, 119 (8), pp.5203-5220. ⟨10.1002/2013JC009124⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2013JC009124 hal-01111515 https://hal.univ-brest.fr/hal-01111515 https://hal.univ-brest.fr/hal-01111515/document https://hal.univ-brest.fr/hal-01111515/file/jgrclacarra.pdf doi:10.1002/2013JC009124 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2013JC009124 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
119 |
container_issue |
8 |
container_start_page |
5203 |
op_container_end_page |
5220 |
_version_ |
1766277349762924544 |
spelling |
ftccsdartic:oai:HAL:hal-01111515v1 2023-05-15T14:05:27+02:00 Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving Lacarra, Maïté Houssais, Marie-Noëlle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Variabilité de l'Océan et de la Glace de mer (VOG) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Laboratoire de microbiologie des environnements extrêmophiles (LM2E) Centre National de la Recherche Scientifique (CNRS)-Université de Brest (UBO)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) 2014-08-15 https://hal.univ-brest.fr/hal-01111515 https://hal.univ-brest.fr/hal-01111515/document https://hal.univ-brest.fr/hal-01111515/file/jgrclacarra.pdf https://doi.org/10.1002/2013JC009124 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1002/2013JC009124 hal-01111515 https://hal.univ-brest.fr/hal-01111515 https://hal.univ-brest.fr/hal-01111515/document https://hal.univ-brest.fr/hal-01111515/file/jgrclacarra.pdf doi:10.1002/2013JC009124 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.univ-brest.fr/hal-01111515 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2014, 119 (8), pp.5203-5220. ⟨10.1002/2013JC009124⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2014 ftccsdartic https://doi.org/10.1002/2013JC009124 2021-11-28T01:17:33Z International audience Summer repeated hydrographic surveys and 4 years of mooring observations are used to characterize for the first time the interannual variability of the bottom water in the Mertz Glacier Polynya (MGP) on the East Antarctic shelf (142 E–146 E). Until 2010, large interannual variability was observed in the summer bottom salinity with year-to-year changes reaching 0.12 in Commonwealth Bay, the region with the highest sea ice production. The summer variability was shown to be linked to the efficiency of the convection during the preceding winter. The recent freshening of the bottom waters subsequent to the Mertz Glacier calving was well beyond the range of the precalving interannual variability. Within 2 years after the event, the bottom water of the shelf became too light to possibly contribute to renewal of the Antarctic Bottom Water. Rough estimates of the freshwater budget of the Ad elie Depression indicate that the freshening necessary to compensate for net sea ice production in the MGP did not change drasti-cally after the Mertz calving. The year-to-year salinity changes appeared to respond to the MGP activity. Yet, prior to the calving, the convective system in the polynya was also partly controlled by the late winter bottom salinity through a mechanism leading to a sequence of alternatively fresher and more saline bot-tom waters over the period 2007–2010. Exceptional events like the Mertz calving seem to be able to switch over the system into a less stratified state where convection responds more directly to changes in the surface forcing. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Adelie Depression ENVELOPE(146.000,146.000,-67.417,-67.417) Antarctic Commonwealth Bay ENVELOPE(142.500,142.500,-67.000,-67.000) East Antarctica Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) The Antarctic Journal of Geophysical Research: Oceans 119 8 5203 5220 |